With evolving lifestyles, audio equipment has expanded beyond basic playback to meet diverse user needs. This study explores functional and design requirements across indoor, outdoor, and vehicular scenarios, identifying key priorities: personalization, multifunctionality, intelligence, convenience, and immersive experience. Through case studies and user interviews, findings show that home and office users seek smart integration and multi-device compatibility, outdoor users prioritize portability and durability, and in-car users focus on immersive sound and seamless system integration. Additionally, demographic factors influence interaction preferences. Future design opportunities include health-focused audio functions, enhanced social attributes, and multi-sensory immersion. By analyzing functional demands, this study proposes optimization strategies that provide practical insights for future audio development. As technology advances, audio devices will play an increasing role in cultural, social, and educational domains, enriching user experiences across various contexts.